Dell optiplex GX280 bluescreen hardrive problem

Hello :)

I start computer and then it stops after Microsoft XP loading screens is away.
It says that the computer had been switched off during a power blackout (whole house went off) and i should start in failsafe mode or start normal - previous options etc. I tried all options and it always comes up bluescreen with same text- My dad tried to see any problem in some blue menu center with text and he said that the hardrive was maybe broken. My dell ensurance is out so i really need help got a LAN coming up in 1-2 weeks. Heres so info from the blue screen UNMOUNTABLE_BOOT_VOLUME

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There's a collection of drivers for the GX280 for Windows 2000 and XP on the Dell website: http://is.gd/ejJcMIf you're running a later version of the operating system (for example a 32 bit version of Windows 7) this webpage might have a solution that will help: http://is.gd/ejJmo (Microsoft Technet community)

You can configure your boot setup from your bios screen (for dell, either F11 or F12) then set up your optical drive as your 1st priority then, save settings. After that, you need to insert your windows XP cd in order for it to boot.